吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (1): 105-110.doi: 10.13229/j.cnki.jdxbgxb20210589

• 材料科学与工程 • 上一篇    

热处理对TC4钛合金激光双束焊接接头疲劳性能的影响

回丽1,2(),陆家琛1,周松1(),安金岚2,周冠妍3,刘小鹏1   

  1. 1.沈阳航空航天大学 机电工程学院，沈阳 110136
    2.沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室，沈阳 110136
    3.中国航空工业集团公司 沈阳飞机设计研究所，沈阳 110136
  • 收稿日期:2021-06-29 出版日期:2023-01-01 发布日期:2023-07-23
  • 通讯作者: 周松 E-mail:syhuili@126.com;zhousong23@163.com
  • 作者简介:回丽（1965-），女，教授，博士. 研究方向：航空材料与结构强度. E-mail： syhuili@126.com
  • 基金资助:
    国家自然科学基金项目(51775355);沈阳航空航天大学航空制造工艺数字化国防重点学科实验室开放基金项目(SHSYS202003)

Effect of heat treatment on fatigue properties of TC4 titanium alloy by laser double beam welded joint

Li HUI1,2(),Jia-chen LU1,Song ZHOU1(),Jin-lan AN2,Guan-yan ZHOU3,Xiao-peng LIU1   

  1. 1.School of Mechanical and Electrical Engineering，Shenyang Aerospace University，Shenyang 110136，China
    2.National Defense Key Discipline Laboratory of Aerospace Manufacturing Process Digitization，Shenyang Aerospace University，Shenyang 110136，China
    3.Shenyang Aircraft Design and Research Institute，Aviation Industry Corporation of China，Shenyang 110136，China
  • Received:2021-06-29 Online:2023-01-01 Published:2023-07-23
  • Contact: Song ZHOU E-mail:syhuili@126.com;zhousong23@163.com

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摘要：

基于飞机金属整体进气道典型件的T形接头在服役过程中因承受空气循环阻力而导致疲劳断裂的问题，利用激光双光束焊接技术对TC4钛合金进行T形焊接后进行热处理，研究不同热处理方法对焊接接头显微组织特征、疲劳性能及断裂机理的影响。结果表明：双重退火热处理试件疲劳寿命是未经热处理试件的1.89倍，一次退火热处理试件疲劳寿命是未经热处理试件的1.43倍。疲劳断口分析表明，与未经热处理试件相比，热处理后试件疲劳裂纹稳定扩展区疲劳条纹间距降低，表明疲劳裂纹扩展速率降低，因此疲劳寿命增大。热处理后网篮组织中析出针状α'马氏体，试件抵抗裂纹萌生和扩展的抗力增强，促进试件疲劳寿命增大。

关键词: TC4钛合金, 疲劳寿命, 热处理, 激光双光束焊, 断裂机理

Abstract:

Based on the problem of fatigue fracture of the T joint of the typical parts of the aircraft metal integral air inlet due to the resistance of air circulation during the service process， the TC4 titanium alloy was heat treated after the T joint welding with the laser double beam welding technology， and different heat treatments were studied. The effects of different heat treatment methods on microstructure， fatigue properties and fracture mechanism of welded joints were investigated. The results show that the fatigue life of the specimens with double annealing treatment is 1.89 times that of the specimens without heat treatment， and the fatigue life of the specimens with one annealing treatment is 1.43 times that of the specimens without heat treatment. The fatigue fracture analysis shows that， compared with the specimens without heat treatment， the fatigue stripe spacing in the stable fatigue crack growth zone of the specimens after heat treatment decreases， indicating that the fatigue crack growth rate decreases， so the fatigue life increases. After heat treatment， acicular α' martensite precipitates in the microstructure of the net basket， which increases the resistance to crack initiation and propagation and promotes the fatigue life of the specimen.

Key words: TC4 titanium alloy, fatigue fracture, heat treatment, laser double beam welding, fracture mechanism

中图分类号: 

  • TG407

图1

激光双光束焊疲劳试件形状和尺寸"

表1

低周疲劳寿命统计结果"

类型疲劳寿命/N

中值疲劳

寿命/N50

对数寿命

平均值/xˉ

标准差/S子样变异系数/Cv
未经热处理试件69 383 35 997 100 843 65 923 54 467 56 67960 9484.785 00.146 8560.030 691
一次退火试件91 672 69 108 102 250 61 432 83 254 130 99286 9124.939 10.117 6170.023 813
双重退火试件97 815 84 284 109 327 93 487 141 708 198 937115 5115.076 50.138 9830.027 453

图2

疲劳断口形貌"

图3

焊接接头熔合区组织形貌"

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